Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4982e4251a352b5…

MALICIOUS

PDF

105.3 KB Created: 2021-06-27 07:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 5beaf5f866fe73de22cef6eb60374e31 SHA-1: 203869fd25d54561eafc0d907d71f4daf8d87eb1 SHA-256: c4982e4251a352b51c89b0a3ea98dd500a9fd7ba7ca7da0c06892aa9fb276d68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://seamcc.com/UserFiles/files/53157336125.pdf In PDF document text
    • http://yfatc.com/userfiles/file/70819020544.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/12352776671.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/663dcddfd38d98fc784125d37c23e9cd/bitisi.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/favimupafabonuf.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160afd3b11a21b---duxomatufob.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/78781095946.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/rigezojinedugeloto.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/fakojik.pdfIn PDF document text
    • http://atraba-holding.com/userfiles/file/wavotejuxusizesu.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/8e2dc6f24acbd3df5516cdad23648c62/jurodekojowipawobop.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/a66c4e653bf7c7a6fc1973e5aedf281f/vofepuzivevutatudipijun.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/9e6ad4643363334de600248796202348/kozeniwafana.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608050a849760---38498424695.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072860416a94---xemojoxobugigokinijonasu.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/jmp7mjl3ihn67qdoctemurgva5/68682192021.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3343dc06e---5237018265.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/sujuxabagivaxazuluwo.pdfIn PDF document text
    • https://p99.tw/pro_pic/files/14868054721.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/84513094450.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160add430dd661---92509444106.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/245e3c4368f7e3371372b394d06ac03e/lokemarosevoxodavanunaxoz.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/0fafda55462b74b3c7dbda5be813310f/48636599441.pdfIn PDF document text
    • http://summithigh75.com/clients/867147/File/rejimiduvemosez.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/89819518723.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=jeremiah+29+meaningPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001540c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1540C 10400 bytes
SHA-256: a8df1bf55f61ee07153ebb1a81bd60020d3552ea04f886b42c5c899b2d6beeee
font_02_sfnt_off00016b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B70 16732 bytes
SHA-256: 32159dbc69fa4a0faba379cfaf091928bcc582b9e97a7b88ace3ee767478df23